Daily records
Page built 2026-10-14
Data as of 2026-10-13
Search
Built 2026-10-14 (14 October 2026)

Olmsted L&D Weather Records (USC00113580)

Record envelope, standing records and threshold days for Olmsted L&D (USC00113580), Illinois, United States, with 104 years of record.

Key Facts for Olmsted L&D

  • Olmsted L&D (USC00113580) is a weather station in Illinois, United States at 37.18 latitude and -89.07 longitude, 114 m (375 ft) above sea level.
  • The station reports from 1923 to 2026, 104 years of record.
  • 1,464 records set at Olmsted L&D still stand.
  • Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
  • Olmsted L&D set a daily record precipitation of 38.9 mm (1.5 in) on 3 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Illinois, United States, 37.18 latitude, -89.07 longitude.
  • Elevation: 114 m (375 ft).
  • Period of record: 1923 to 2026, 104 years.
  • Eligible elements: tmax, tmin, prcp, snow.

Daily Record Envelope and 2026

21 days at or beyond a record
Daily record high and record low at Olmsted L&D, with 2026 drawn through them The band shows the record high and record low for each calendar day at Olmsted L&D. The lines show the 2026 daily maximum and minimum. 21 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Olmsted L&D. The lines show the 2026 daily maximum and minimum. 21 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Olmsted L&D, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan21.7 C (71.1 F)-20.0 C (-4.0 F)20.0 C (68.0 F)-17.2 C (1.0 F)
Feb24.4 C (75.9 F)-22.2 C (-8.0 F)20.6 C (69.1 F)-11.7 C (10.9 F)
Mar27.2 C (81.0 F)-18.3 C (-0.9 F)27.2 C (81.0 F)-6.7 C (19.9 F)
Apr31.7 C (89.1 F)-9.4 C (15.1 F)27.8 C (82.0 F)0.0 C (32.0 F)
May35.6 C (96.1 F)1.7 C (35.1 F)30.0 C (86.0 F)6.1 C (43.0 F)
Jun40.0 C (104.0 F)6.1 C (43.0 F)32.2 C (90.0 F)15.0 C (59.0 F)
Jul40.6 C (105.1 F)10.6 C (51.1 F)34.4 C (93.9 F)19.4 C (66.9 F)
Aug40.0 C (104.0 F)10.0 C (50.0 F)36.1 C (97.0 F)18.3 C (64.9 F)
Sep42.2 C (108.0 F)2.2 C (36.0 F)37.2 C (99.0 F)12.2 C (54.0 F)
Oct34.4 C (93.9 F)-5.0 C (23.0 F)32.8 C (91.0 F)9.4 C (48.9 F)
Nov26.7 C (80.1 F)-11.1 C (12.0 F)n/an/a
Dec23.3 C (73.9 F)-22.2 C (-8.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Olmsted L&D by the year they were set 1,464 records at Olmsted L&D still stand. 1925 holds the most, with 113. 0501001501923: 241924: 731925: 1131926: 531927: 951928: 611995: 111996: 491997: 331998: 381999: 302000: 562001: 392002: 382003: 242004: 282005: 392006: 312007: 352008: 242009: 212010: 302011: 302012: 642013: 322014: 422015: 412016: 232017: 272018: 192019: 322020: 192021: 232022: 382023: 252024: 362025: 342026: 341923192719972001200520092013201720212025
1,464 records at Olmsted L&D still stand. 1925 holds the most, with 113.
Standing records at Olmsted L&D by the year they were set
Year setStanding records
192324
192473
1925113
192653
192795
192861
199511
199649
199733
199838
199930
200056
200139
200238
200324
200428
200539
200631
200735
200824
200921
201030
201130
201264
201332
201442
201541
201623
201727
201819
201932
202019
202123
202238
202325
202436
202534
202634

Wettest Day of Each Month

Mar: 179.6 mm (7.1 in)
Record daily precipitation for each month at Olmsted L&D The wettest day on record for each calendar month at Olmsted L&D. The most was 179.6 mm (7.1 in) on 31 March 1938. 050100150200 Jan: 113.5 mm (4.5 in), 24 January 2002 Jan Feb: 82.6 mm (3.3 in), 16 February 2025 Feb Mar: 179.6 mm (7.1 in), 31 March 1938 Mar Apr: 163.3 mm (6.4 in), 4 April 2008 Apr May: 117.9 mm (4.6 in), 25 May 1946 May Jun: 88.9 mm (3.5 in), 1 June 2013 Jun Jul: 170.2 mm (6.7 in), 20 July 2023 Jul Aug: 110.0 mm (4.3 in), 23 August 1942 Aug Sep: 105.4 mm (4.1 in), 25 September 1945 Sep Oct: 133.4 mm (5.3 in), 18 October 2007 Oct Nov: 112.3 mm (4.4 in), 22 November 1934 Nov Dec: 117.1 mm (4.6 in), 17 December 2001 Dec
The wettest day on record for each calendar month at Olmsted L&D. The most was 179.6 mm (7.1 in) on 31 March 1938.
Record daily precipitation for each month at Olmsted L&D
MonthRecord daily precipitation (mm)Date
Jan113.5 mm (4.5 in)24 January 2002
Feb82.6 mm (3.3 in)16 February 2025
Mar179.6 mm (7.1 in)31 March 1938
Apr163.3 mm (6.4 in)4 April 2008
May117.9 mm (4.6 in)25 May 1946
Jun88.9 mm (3.5 in)1 June 2013
Jul170.2 mm (6.7 in)20 July 2023
Aug110.0 mm (4.3 in)23 August 1942
Sep105.4 mm (4.1 in)25 September 1945
Oct133.4 mm (5.3 in)18 October 2007
Nov112.3 mm (4.4 in)22 November 1934
Dec117.1 mm (4.6 in)17 December 2001

Period of Record Coverage

1923 to 2026
Days with data per year at Olmsted L&D 39 years of record at Olmsted L&D, 1923 to 2026. 12 years have data for under 90 percent of days and are left out of rankings: 1923, 1929, 1995, 2011, 2012, 2014, 2016, 2017 and others. 1923: 178 of 365 days1924: 364 of 366 days1925: 361 of 365 days1926: 365 of 365 days1927: 363 of 365 days1928: 366 of 366 days1929: 5 of 365 days1995: 61 of 365 days1996: 365 of 366 days1997: 360 of 365 days1998: 361 of 365 days1999: 358 of 365 days2000: 365 of 366 days2001: 339 of 365 days2002: 363 of 365 days2003: 360 of 365 days2004: 361 of 366 days2005: 361 of 365 days2006: 329 of 365 days2007: 355 of 365 days2008: 349 of 366 days2009: 347 of 365 days2010: 344 of 365 days2011: 285 of 365 days2012: 318 of 366 days2013: 332 of 365 days2014: 313 of 365 days2015: 332 of 365 days2016: 299 of 366 days2017: 221 of 365 days2018: 179 of 365 days2019: 330 of 365 days2020: 320 of 366 days2021: 337 of 365 days2022: 349 of 365 days2023: 318 of 365 days2024: 353 of 366 days2025: 331 of 365 days2026: 272 of 365 days19251995200020052010201520202025
39 years of record at Olmsted L&D, 1923 to 2026. 12 years have data for under 90 percent of days and are left out of rankings: 1923, 1929, 1995, 2011, 2012, 2014, 2016, 2017 and others.
Days with data per year at Olmsted L&D
YearDays with dataShare of yearComplete
192317849%No
192436499%Yes
192536199%Yes
1926365100%Yes
192736399%Yes
1928366100%Yes
192951%No
19956117%No
1996365100%Yes
199736099%Yes
199836199%Yes
199935898%Yes
2000365100%Yes
200133993%Yes
200236399%Yes
200336099%Yes
200436199%Yes
200536199%Yes
200632990%Yes
200735597%Yes
200834995%Yes
200934795%Yes
201034494%Yes
201128578%No
201231887%No
201333291%Yes
201431386%No
201533291%Yes
201629982%No
201722161%No
201817949%No
201933090%Yes
202032087%No
202133792%Yes
202234996%Yes
202331887%No
202435396%Yes
202533191%Yes
202627275%No

Latest Records

20
Latest records at Olmsted L&D
DateStationRecordValueBeat old record byOld record stoodSignificance
3 October 2026Olmsted L&D, USdaily rain (Provisional)38.9 mm (1.5 in)6.4 mm (0.25 in)88 years39 of 100 (Notable)
21 September 2026Olmsted L&D, USdaily high max (Tie, Provisional)35.6 C (96.1 F)tie4 years2 of 100 (Routine)
20 September 2026Olmsted L&D, USdaily high max (Provisional)36.7 C (98.1 F)2.8 C (5.0 F)100 years46 of 100 (Notable)
19 September 2026Olmsted L&D, USdaily high max (Provisional)36.7 C (98.1 F)0.6 C (1.1 F)100 years41 of 100 (Notable)
19 September 2026Olmsted L&D, USdaily high min (Provisional)22.8 C (73.0 F)0.6 C (1.1 F)100 years41 of 100 (Notable)
18 September 2026Olmsted L&D, USdaily high max (Provisional)36.1 C (97.0 F)1.1 C (2.0 F)100 years42 of 100 (Notable)
18 September 2026Olmsted L&D, USdaily high min (Tie, Provisional)23.3 C (73.9 F)tie100 years10 of 100 (Routine)
17 September 2026Olmsted L&D, USdaily high min (Provisional)23.9 C (75.0 F)1.1 C (2.0 F)99 years41 of 100 (Notable)
12 September 2026Olmsted L&D, USdaily high min (Tie, Provisional)21.7 C (71.1 F)tie99 years9 of 100 (Routine)
6 September 2026Olmsted L&D, USdaily high min (Provisional)25.0 C (77.0 F)2.2 C (4.0 F)100 years44 of 100 (Notable)
5 September 2026Olmsted L&D, USdaily high min (Provisional)25.0 C (77.0 F)3.3 C (5.9 F)100 years47 of 100 (Notable)
4 September 2026Olmsted L&D, USdaily high min (Provisional)24.4 C (75.9 F)1.1 C (2.0 F)100 years42 of 100 (Notable)
3 September 2026Olmsted L&D, USdaily high min (Provisional)25.0 C (77.0 F)1.7 C (3.1 F)100 years43 of 100 (Notable)
1 September 2026Olmsted L&D, USdaily high min (Tie, Provisional)23.9 C (75.0 F)tie13 years3 of 100 (Routine)
17 August 2026Olmsted L&D, USdaily high min (Provisional)24.4 C (75.9 F)0.5 C (0.9 F)12 years14 of 100 (Routine)
16 August 2026Olmsted L&D, USdaily high min (Provisional)25.0 C (77.0 F)1.7 C (3.1 F)28 years23 of 100 (Routine)
15 August 2026Olmsted L&D, USdaily high min (Provisional)25.6 C (78.1 F)1.2 C (2.2 F)16 years18 of 100 (Routine)
14 August 2026Olmsted L&D, USdaily high min25.6 C (78.1 F)2.3 C (4.1 F)103 years47 of 100 (Notable)
12 August 2026Olmsted L&D, USdaily high min (Tie)25.0 C (77.0 F)tie103 years10 of 100 (Routine)
1 August 2026Olmsted L&D, USdaily rain68.6 mm (2.7 in)2.6 mm (0.10 in)92 years38 of 100 (Notable)

Climate Trend

23 complete years, 1924 to 2025
Annual mean temperature at Olmsted L&D as warming stripes, 1924 to 2025 One stripe for each of 23 complete years at Olmsted L&D, 1924 to 2025. Blue stripes are years cooler than the station's own mean of 14.4 C (58.0 F); red stripes are warmer. The coolest year was 1996, at 13.2 C (55.7 F), and the warmest was 2024, at 15.9 C (60.7 F). The strongest colour marks a difference of 1.5 C (2.7 F). 1924: 13.6 C, -0.9 C from the station mean1925: 15.4 C, +1.0 C from the station mean1926: 14.3 C, -0.2 C from the station mean1927: 15.0 C, +0.6 C from the station mean1928: 14.2 C, -0.3 C from the station mean1996: 13.2 C, -1.3 C from the station mean1997: 13.3 C, -1.2 C from the station mean1998: 15.3 C, +0.8 C from the station mean1999: 14.6 C, +0.1 C from the station mean2002: 14.5 C, +0.1 C from the station mean2003: 13.8 C, -0.6 C from the station mean2004: 14.3 C, -0.2 C from the station mean2005: 14.3 C, -0.2 C from the station mean2007: 15.0 C, +0.5 C from the station mean2009: 13.8 C, -0.6 C from the station mean2010: 14.4 C, -0.1 C from the station mean2013: 13.5 C, -0.9 C from the station mean2016: 15.0 C, +0.5 C from the station mean2020: 14.9 C, +0.4 C from the station mean2021: 15.0 C, +0.5 C from the station mean2022: 14.3 C, -0.2 C from the station mean2024: 15.9 C, +1.5 C from the station mean2025: 15.0 C, +0.5 C from the station mean19241930194019501960197019801990200020102020
One stripe for each of 23 complete years at Olmsted L&D, 1924 to 2025. Blue stripes are years cooler than the station's own mean of 14.4 C (58.0 F); red stripes are warmer. The coolest year was 1996, at 13.2 C (55.7 F), and the warmest was 2024, at 15.9 C (60.7 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Olmsted L&D as warming stripes, 1924 to 2025
YearAnnual mean temperatureDifference from the station mean
192413.6 C-0.86 C
192515.4 C+1.00 C
192614.3 C-0.16 C
192715.0 C+0.56 C
192814.2 C-0.29 C
199613.2 C-1.28 C
199713.3 C-1.17 C
199815.3 C+0.81 C
199914.6 C+0.13 C
200214.5 C+0.06 C
200313.8 C-0.64 C
200414.3 C-0.15 C
200514.3 C-0.19 C
200715.0 C+0.54 C
200913.8 C-0.64 C
201014.4 C-0.05 C
201313.5 C-0.94 C
201615.0 C+0.54 C
202014.9 C+0.42 C
202115.0 C+0.52 C
202214.3 C-0.15 C
202415.9 C+1.49 C
202515.0 C+0.51 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1923 to 2026
Yearly extremes at Olmsted L&D: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.2 C (108.0 F)192536.7 C (98.1 F)39
Coldest night (TNn)-22.2 C (-8.0 F)2015-15.6 C (3.9 F)39
Wettest day (Rx1day)179.6 mm (7.1 in)193879.8 mm (3.1 in)63
Wettest five days (Rx5day)281.2 mm (11.1 in)2023122.1 mm (4.8 in)63
Longest dry spell (CDD)44 days192419 days63

Hottest day (TXx)

Hottest day (TXx) at Olmsted L&D by year The hottest day of the year at Olmsted L&D, 1923 to 2026. The record is 42.2 C (108.0 F) in 1925, marked on the chart; the median year is 36.7 C (98.1 F). 0102030405019401960198020002020Record: 42.2 C (108.0 F) in 1925
The hottest day of the year at Olmsted L&D, 1923 to 2026. The record is 42.2 C (108.0 F) in 1925, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Olmsted L&D by year
YearHottest day (TXx)
192336.7 C (98.1 F)
192435.6 C (96.1 F)
192542.2 C (108.0 F)
192638.3 C (100.9 F)
192736.7 C (98.1 F)
192836.1 C (97.0 F)
19297.8 C (46.0 F)
1930n/a
1931n/a
1932n/a
1933n/a
1934n/a
1935n/a
1936n/a
1937n/a
1938n/a
1939n/a
1940n/a
1941n/a
1942n/a
1943n/a
1944n/a
1945n/a
1946n/a
1947n/a
1948n/a
1949n/a
1991n/a
1992n/a
1993n/a
1994n/a
199521.1 C (70.0 F)
199636.1 C (97.0 F)
199737.2 C (99.0 F)
199835.0 C (95.0 F)
199936.7 C (98.1 F)
200037.8 C (100.0 F)
200136.1 C (97.0 F)
200237.8 C (100.0 F)
200335.6 C (96.1 F)
200436.7 C (98.1 F)
200536.1 C (97.0 F)
200635.6 C (96.1 F)
200738.9 C (102.0 F)
200834.4 C (93.9 F)
200936.1 C (97.0 F)
201038.3 C (100.9 F)
201138.9 C (102.0 F)
201240.6 C (105.1 F)
201336.1 C (97.0 F)
201435.0 C (95.0 F)
201535.0 C (95.0 F)
201636.7 C (98.1 F)
201735.6 C (96.1 F)
201835.0 C (95.0 F)
201936.7 C (98.1 F)
202035.0 C (95.0 F)
202135.0 C (95.0 F)
202236.7 C (98.1 F)
202337.2 C (99.0 F)
202437.8 C (100.0 F)
202536.7 C (98.1 F)
202637.2 C (99.0 F)

Coldest night (TNn)

Coldest night (TNn) at Olmsted L&D by year The coldest night of the year at Olmsted L&D, 1923 to 2026. The record is -22.2 C (-8.0 F) in 2015, marked on the chart; the median year is -15.6 C (3.9 F). -25-20-15-10-519401960198020002020Record: -22.2 C (-8.0 F) in 2015
The coldest night of the year at Olmsted L&D, 1923 to 2026. The record is -22.2 C (-8.0 F) in 2015, marked on the chart; the median year is -15.6 C (3.9 F).
Coldest night (TNn) at Olmsted L&D by year
YearColdest night (TNn)
1923-5.6 C (21.9 F)
1924-21.1 C (-6.0 F)
1925-17.8 C (0.0 F)
1926-16.7 C (1.9 F)
1927-17.8 C (0.0 F)
1928-20.0 C (-4.0 F)
1929-11.1 C (12.0 F)
1930n/a
1931n/a
1932n/a
1933n/a
1934n/a
1935n/a
1936n/a
1937n/a
1938n/a
1939n/a
1940n/a
1941n/a
1942n/a
1943n/a
1944n/a
1945n/a
1946n/a
1947n/a
1948n/a
1949n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995-16.1 C (3.0 F)
1996-21.7 C (-7.1 F)
1997-18.9 C (-2.0 F)
1998-13.9 C (7.0 F)
1999-12.8 C (9.0 F)
2000-16.7 C (1.9 F)
2001-15.0 C (5.0 F)
2002-11.1 C (12.0 F)
2003-17.8 C (0.0 F)
2004-15.6 C (3.9 F)
2005-12.8 C (9.0 F)
2006-14.4 C (6.1 F)
2007-12.8 C (9.0 F)
2008-15.0 C (5.0 F)
2009-16.7 C (1.9 F)
2010-15.6 C (3.9 F)
2011-15.6 C (3.9 F)
2012-7.8 C (18.0 F)
2013-12.2 C (10.0 F)
2014-17.8 C (0.0 F)
2015-22.2 C (-8.0 F)
2016-13.3 C (8.1 F)
2017-13.3 C (8.1 F)
2018-16.7 C (1.9 F)
2019-12.8 C (9.0 F)
2020-10.6 C (12.9 F)
2021-20.0 C (-4.0 F)
2022-22.2 C (-8.0 F)
2023-7.8 C (18.0 F)
2024-17.2 C (1.0 F)
2025-17.8 C (0.0 F)
2026-17.2 C (1.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Olmsted L&D by year The wettest day of the year at Olmsted L&D, 1923 to 2026. The record is 179.6 mm (7.1 in) in 1938, marked on the chart; the median year is 79.8 mm (3.1 in). 05010015020019401960198020002020Record: 179.6 mm (7.1 in) in 1938
The wettest day of the year at Olmsted L&D, 1923 to 2026. The record is 179.6 mm (7.1 in) in 1938, marked on the chart; the median year is 79.8 mm (3.1 in).
Wettest day (Rx1day) at Olmsted L&D by year
YearWettest day (Rx1day)
192358.4 mm (2.3 in)
192448.3 mm (1.9 in)
192581.3 mm (3.2 in)
192648.3 mm (1.9 in)
192769.9 mm (2.8 in)
192882.6 mm (3.3 in)
192982.6 mm (3.3 in)
193054.1 mm (2.1 in)
193159.4 mm (2.3 in)
193261.0 mm (2.4 in)
1933111.0 mm (4.4 in)
1934112.3 mm (4.4 in)
193590.2 mm (3.6 in)
193648.5 mm (1.9 in)
193781.5 mm (3.2 in)
1938179.6 mm (7.1 in)
1939111.5 mm (4.4 in)
194050.8 mm (2.0 in)
194183.1 mm (3.3 in)
1942115.1 mm (4.5 in)
194371.1 mm (2.8 in)
194481.3 mm (3.2 in)
1945105.4 mm (4.1 in)
1946117.9 mm (4.6 in)
194748.3 mm (1.9 in)
194879.8 mm (3.1 in)
194979.2 mm (3.1 in)
199165.3 mm (2.6 in)
199264.8 mm (2.6 in)
199361.0 mm (2.4 in)
199481.3 mm (3.2 in)
199566.0 mm (2.6 in)
199653.3 mm (2.1 in)
199771.9 mm (2.8 in)
199866.0 mm (2.6 in)
199955.4 mm (2.2 in)
2000100.1 mm (3.9 in)
2001117.1 mm (4.6 in)
2002113.5 mm (4.5 in)
200386.9 mm (3.4 in)
200453.3 mm (2.1 in)
200571.4 mm (2.8 in)
2006100.3 mm (3.9 in)
2007133.4 mm (5.3 in)
2008163.3 mm (6.4 in)
200983.8 mm (3.3 in)
201071.1 mm (2.8 in)
201183.3 mm (3.3 in)
201266.0 mm (2.6 in)
2013104.1 mm (4.1 in)
201451.6 mm (2.0 in)
201597.8 mm (3.9 in)
201669.9 mm (2.8 in)
201754.4 mm (2.1 in)
2018108.5 mm (4.3 in)
201994.2 mm (3.7 in)
202076.2 mm (3.0 in)
202173.4 mm (2.9 in)
202279.0 mm (3.1 in)
2023170.2 mm (6.7 in)
202496.5 mm (3.8 in)
202584.6 mm (3.3 in)
202668.6 mm (2.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Olmsted L&D by year The wettest five days of the year at Olmsted L&D, 1923 to 2026. The record is 281.2 mm (11.1 in) in 2023, marked on the chart; the median year is 122.1 mm (4.8 in). 010020030019401960198020002020Record: 281.2 mm (11.1 in) in 2023
The wettest five days of the year at Olmsted L&D, 1923 to 2026. The record is 281.2 mm (11.1 in) in 2023, marked on the chart; the median year is 122.1 mm (4.8 in).
Wettest five days (Rx5day) at Olmsted L&D by year
YearWettest five days (Rx5day)
192387.6 mm (3.4 in)
192462.2 mm (2.4 in)
1925135.7 mm (5.3 in)
192691.2 mm (3.6 in)
1927190.8 mm (7.5 in)
192896.8 mm (3.8 in)
1929103.5 mm (4.1 in)
1930135.6 mm (5.3 in)
193174.7 mm (2.9 in)
1932122.1 mm (4.8 in)
1933130.3 mm (5.1 in)
1934144.1 mm (5.7 in)
1935157.0 mm (6.2 in)
193682.6 mm (3.3 in)
1937212.0 mm (8.3 in)
1938219.7 mm (8.6 in)
1939135.1 mm (5.3 in)
194068.9 mm (2.7 in)
194183.8 mm (3.3 in)
1942126.5 mm (5.0 in)
1943105.6 mm (4.2 in)
1944106.4 mm (4.2 in)
1945131.0 mm (5.2 in)
1946140.3 mm (5.5 in)
194778.5 mm (3.1 in)
194896.9 mm (3.8 in)
1949136.9 mm (5.4 in)
199191.9 mm (3.6 in)
199278.0 mm (3.1 in)
1993129.3 mm (5.1 in)
199487.6 mm (3.4 in)
199596.5 mm (3.8 in)
199667.6 mm (2.7 in)
1997167.9 mm (6.6 in)
1998110.4 mm (4.3 in)
199981.2 mm (3.2 in)
2000131.9 mm (5.2 in)
2001170.4 mm (6.7 in)
2002138.9 mm (5.5 in)
2003156.0 mm (6.1 in)
200481.5 mm (3.2 in)
200593.8 mm (3.7 in)
2006135.9 mm (5.4 in)
2007139.8 mm (5.5 in)
2008197.4 mm (7.8 in)
2009141.1 mm (5.6 in)
2010139.7 mm (5.5 in)
2011217.2 mm (8.6 in)
201279.2 mm (3.1 in)
2013114.6 mm (4.5 in)
201492.7 mm (3.6 in)
2015175.3 mm (6.9 in)
2016166.8 mm (6.6 in)
2017115.4 mm (4.5 in)
2018141.5 mm (5.6 in)
201995.3 mm (3.8 in)
202085.6 mm (3.4 in)
202174.4 mm (2.9 in)
202289.2 mm (3.5 in)
2023281.2 mm (11.1 in)
2024115.8 mm (4.6 in)
2025233.7 mm (9.2 in)
2026135.9 mm (5.4 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Olmsted L&D by year The longest dry spell of the year at Olmsted L&D, 1923 to 2026. The record is 44 days in 1924, marked on the chart; the median year is 19 days. 102030405019401960198020002020Record: 44 days in 1924
The longest dry spell of the year at Olmsted L&D, 1923 to 2026. The record is 44 days in 1924, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Olmsted L&D by year
YearLongest dry spell (CDD)
192315 days
192444 days
192522 days
192620 days
192720 days
192831 days
192915 days
193025 days
193116 days
193214 days
193330 days
193436 days
193518 days
193623 days
193720 days
193830 days
193937 days
194015 days
194120 days
194216 days
194325 days
194430 days
194515 days
194623 days
194719 days
194820 days
194910 days
199113 days
199219 days
199317 days
199412 days
199526 days
199618 days
199714 days
199836 days
199943 days
200022 days
200115 days
200232 days
200327 days
200443 days
200521 days
200616 days
200732 days
200817 days
200917 days
201015 days
201116 days
201218 days
201315 days
201419 days
201525 days
201612 days
201711 days
201810 days
201913 days
202020 days
202113 days
202229 days
202312 days
202426 days
202515 days
202615 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

23 years with a frost

Across 23 years with a frost, the median last spring frost at Olmsted L&D falls on 31 March and the median first autumn frost on 4 November, which leaves a median of 211 days between them.

Frost dates and growing season at Olmsted L&D
MeasureMedian, all yearsEarliest periodRecent period (1924 to 2025)Recent against earliestFitted trend
Last spring frost31 Marchn/a31 Marchn/an/a
First autumn frost4 Novembern/a4 Novembern/an/a
Growing days211 daysn/a211 daysn/an/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

53 years, 1924 to 2025

A day with at least 79.0 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 174.8 mm (6.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Olmsted L&D: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years79.0 mm (3.1 in)
5 years103.8 mm (4.1 in)
10 years120.6 mm (4.7 in)
25 years142.1 mm (5.6 in)
50 years158.4 mm (6.2 in)
100 years174.8 mm (6.9 in)Longer than the 53 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 53 years of values from 1924 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 179.6 mm (7.1 in) in 1938; 163.3 mm (6.4 in) in 2008; 133.4 mm (5.3 in) in 2007.

Download the Data

  • Data for Olmsted L&D standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Olmsted L&D threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-12 (12 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-13).